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Apposite (adj). very applicable; well adapted; suitable or fit; relevant; pat; -- followed by to; as, this argument is very apposite to the case. Origin: [L. appositus, p. p. of apponere to set or put to; ad + ponere to put, place.].
Definition of apatite. : any of a group of calcium phosphate minerals occurring in various colors as hexagonal crystals, as granular masses, or in fine-grained masses as the chief constituent of phosphate rock and of bones and teeth; especially : calcium phosphate fluoride.